ABB rec670 - Page 203

GlobalBaseSel: It is used to select a GBASVAL function for reference of base values.
RotResU
: It is a setting for rotating the polarizing quantity (3V
0
) by 0 or 180 degrees.
This parameter is set to 180 degrees by default in order to inverse the residual voltage
(3V
0
) to calculate the reference voltage (-3V
0
e
-jRCADir
). Since the reference voltage is
used as the polarizing quantity for directionality, it is important to set this parameter
correctly.
With the setting OpModeSel the principle of directional function is chosen.
With OpModeSel set to 3I0cosfi the current component in the direction equal to the
characteristic angleRCADir has the maximum sensitivity. The characteristic for
RCADir is equal to 0° is shown in Figure
81.
-3V
0
=V
ref
3I
0
RCA = 0°, ROA = 90°
= ang(3I
0
) - ang(3V
ref
)
3I
0
cos
en06000648_ansi.vsd
V
ref
ANSI06000648 V1 EN-US
Figure 81: Characteristic for RCADir equal to 0°
The characteristic is for RCADir equal to -90° is shown in Figure
82.
1MRK 511 401-UUS A Section 8
Current protection
Bay control REC670 2.2 ANSI 197
Application manual